Income Taxes - Schedule of open tax years for which the company could be subject to income tax examination (Details)	12 Months Ended
	Dec. 31, 2015
United States | Minimum
Income Tax Examination [Line Items]
Year under examination	2012
United States | Maximum
Income Tax Examination [Line Items]
Year under examination	2015
Wisconsin | Minimum
Income Tax Examination [Line Items]
Year under examination	2009
Wisconsin | Maximum
Income Tax Examination [Line Items]
Year under examination	2015
China | Minimum
Income Tax Examination [Line Items]
Year under examination	2007
China | Maximum
Income Tax Examination [Line Items]
Year under examination	2015
France | Minimum
Income Tax Examination [Line Items]
Year under examination	2013
France | Maximum
Income Tax Examination [Line Items]
Year under examination	2015
Germany | Minimum
Income Tax Examination [Line Items]
Year under examination	2006
Germany | Maximum
Income Tax Examination [Line Items]
Year under examination	2015